Three-way lamp socket



' April 17, 1928. v 1,666,248 c. scHuLDT THREE -WAY LAMP SOCKET Filed Julv 22, 1925 2 sheets-sneer 1 n l I April 17, 1928. 1,666,248

c. scHULDT THREE-WAY LAMP SOCKET Filed July 22, 1925 2 sheets-snee; '2

Z0 I e v la grwanl'cr @Wemag Patented Apr. 17, 1928.

PATENT OFFICE.

CLARENCE SCHULDT, 0F DES PLAINES, ILLINOIS.

THREE-WAY LAMP socxEr.

Application filed July 22, 1925.

This invention relates to lamp sockets having a three way circuit.

An object of the invention resides in pro` viding a lamp socket having a three way or three wire circuit leading thereto for conveying the source of power to the socket, and which is provided with a switch mechanism for controlling the wire connections with the socket so as to controla lamp mounted in the socket independently of a remote controlling switch with which the three wire circuit connects in order that the lamp may be either controlled from a wall switch orthe switch thereon.

A further object of the invent-ion resides in providing a combined lamp socket and switch construction for a three wire circuit wherein the switch construction in the lamp socket is adapted -to control the circuit to the socket independently of the remote control switch, and wherein the construction ol the switch and socket is such as to provide for the use of conveniently stamped contact members and switch members adapted to cooperate in the most efficient manner to control the circuit.

The invention comprehends other objects and improvements in the details of construction and arrangement of the parts which are more particularly pointed out in the following detailed description and in the claim directed to a preferred form of the invention, it being understood, however, that; va rious changes in the size, shape and arranges ment oi the parts may be made without departing from the spirit or scope of the invention as herein set forth. v

In the drawings forming part of this application Figure 1 is a vertical sectional view through the socket construction showing the switch construction and insulating plates in elevation with parts thereof broken away in order to clearly illustrate the details of the structure.

Fig. 2 is a View similar to Fig. l taken at right angles to Fig. l.

Fig. 3 is a horizontal sectional view taken on line 3 3 of Fig. l.

Fig. 4 is a horizontal sectional view taken on line 4.-4 of Fig. 1.

Fig. 5 is a detail plan view of the switch mechanism and operating member therefor.

Fig. 6 is an enlarged detail perspective of the switch member.

Serial No. 45,340.

Fig. 7 is an enlarged detail perspective of the double contact member.

Fig. 8 is an enlarged detail perspective of one of the single contact members.

Fig. 9 is a diagrammatic view illustrating the wiring connection for the socket and enclosed switch in its associated relation with a wall switch remotely located with respect to the socket, and i Fig. 10 is a detail perspective view of the lower insulating plate.

A pair of insulatin'g plates of annular form are indicated at l and 2 respectively which are mounted in spaced parallel relation by a plurality of U-shaped brackets 3 which are four in number in the present villustration and mounted in substantially equal spaced relation with respect to each other circumferentially between the plate members. Suitable screw members indicated by the numerals 4 and 5 respectively, secure the plate members to the end portion of these U-shaped bracket members, while the screw members 5 secure the metallic socket electrode 6 to the lower face of the plate member 2, one of the screws 5 having electrical contacts therewith for making circuit connection between one of the brackets and the socket contact 6, while the remaining screws are insulated therefrom by suitable insulating members 7 The central portion of the upper side ot the plate member2 is formed with a substantially cylindrical upward projection 8 which is cut away to provide a plurality and in the present instance four circumferentially arranged inclined surfaces 9, all oi which incline in the same direction. Two of the adjacent inclined surfaces 9 have the contact portions of the single contact mem bers l() positioned thereon, said contact portions being of arcuate form as indicated by the numeral 11 particularly in Fig. 8. These contact portions 11 of the single contact members extend throughout substantially the entire length of the adjacent inclined portion, terminating slightly short of the end of the said inclined portion. The central outer edges of the contact portions ll of the single contact members are formed with strip extensions 12 having lateral bent ends which are adapted to seat under the end of the bracket members 3 as illustrated in Figs. l and3 so as to make electrical connection with said bracket member.

A double contact member is shown at la which is provided with a pair of inclined contact portions 15 and 16 respectively which are joined at the offset ends by the portions 17, while the central portion of the contact portion 16 is formed with an outwardly directed angular extension 18 to provide a toot adapted to seat under one ot the bracket members 3. The arcuate contact `portions 15 and 16 are adapted to seat on the'remaining Vtwo adjacent inclined portions 9 oft the projection 8 for a purpose which-will be presently described.

It is noted that the strip portion 18 'or the double contactV member seats under the bracket 3 which is Aelectrically connected through the screw 5 to the shell'clectro'de 6 so that one portion ot' the circuit is formed through these members.

1t should now be understood thatthe provision of the two single contact members and the double 'contact member prcvide'selectrical connection tor circuits to each of these contact members with three of the brackets 3 as illustrated clearly in Fig. 3, whileA the fourth bracket 3 is adaptedto provide electrical connection with the screw 5 securing into the plate member 2 with 'the central contact 2O within the shell 'electrode 6 as illustrated in Figs. 1 and 2. This central contact within the shell electrode which receives the central contacten a lamp baseris of the resilient strip type adapted 'to malte firm connection with the lamp base when placed in the socket. These 'bracket members 3 are provided with binding screws 21 to receive the three circuit wire connection 'tromaremotely operated switch, in amanner 'as will be presently described.

The central .portion of the insulating plate 2 isjtormed with a bore 23 whilethe pla-te 1 is formed lwitha socket in 'axial alinemcnt with the bore 23 for receiving a rod sectien 24 having' the ends seated. in the respective alined bores and secured therein-by the assembly of the two plate members through the medium of the brackets 3. A, switch member which is l'formed oi 'stamped sheet niaterial as shown particularlyin Figa-6 and indicated by Ythe numeral '25 rotatably mounted on therod 24 which is received through the opening 26. This switch meinber is formed Vwithswitch extensions 27 eX- tending voutwardly yin opposite directions from the central portion and which are provided with 'oppositely inclined contact seats 28`arranged inposition to to the inclined 4surfaces 9 and the Icontact members seatedthereon in the operation ot the switch member.

The switch member '25 is'provided with angular :extensions 29 so V'as to provide Aa 'cruciiform `central portion around the central opening 26. A disk member 36 is mounted on an insulating plate 31 and is provided with a pluralityy of outwardly struck lugs 30 which are adapted to cooperate with the edges of the projections 29 and the switch blades 27 for producing a rotation of the switch in step by step relation in one directiononly in the oscillating movement `of the plate member .31. The plate member 31 and the disk 30 are provided with openings for rotatable mounting on the rod 24 while the periphery ot the plate member 31 carries a channel member 32 which is dapted to receive and retain 'the usual chain pull yused in socket constructions of this general character.

A spring 33 of coiled form is mounted on the rod 24 betwecn'thc plate 1 and the .plate member 31 for iorcing the respective parts including `the switch member towards the contact members mounte'd'on the .upper 'tace ot the plate 2.

A suitable form 'ot two part housingfhav'- ing a main body 34 and afcap portion 35 is provided for receiving the'ab'ove described structure in order to irmly house the same which is lined with an insulating lining 36 in theV usual manner, while the `cap portion is provided with a cylindrical projection V37 to provide means whereby it maybe attached to suitable portions or a'nelectric fixture. The body 34 of the housing is `provided at 38 with a chain guide for the pull chain adapted to operate the switch mechanism. The spring member 33 furthermore has one end anchored in the plate 1 while the opposite end is anchored ais indicated a't39 `in the plate member 30 so as to normallyro- Vtate said plate `member through a quarter turn so that it will be rotated tor producing a successive step by step movement in the manual operation thereof in one direction through a quarter turn in the usualmanner that pull sockets ofthis-general character are operated in well .known two vcircuit Vsocket constructions.

Y Referring'particularly lto Fig. Qvshowin'g the wiring diagram of the socket, the shell electrode 6 is connected to the double contact member 14 while. the central contact 20 is connected directly with a suitable source of power through vthe wire 410.v The 'other side ot the circuit from the source of 'contact is provided with a wire Vconnection"111 through a wall switch or other remotely located switch indicated by the numeral 42 which is provided with a movable switch brace 43 and a pair v of'c'ontacts 44 and 45 respectively. rlhe "contacts 4.41 'and '45 are connected by the wires a6 and 47 respectively to the two single contactni'embers 10.

1t will now be 'seen that in the operation of the switch member 25 that'eachflpo'le will rotate the switch member `ia. 'quarter turn so that it is always maintained incontact at' one end or the other with the 'doublecontact member while the opposite "sideis 'mainhis tained in contact with one of the single contact members. In this Way the circuit to the lamp socket can be controlled independently by the switch member to close the circuit to a lamp in said socket or open the same regardless of the position of the switch blades 43. It will also be apparent that the switch blade 43 can be operated to close or open the circuit to the light as desired independently of the switch 25. By the provision of this three Way socket kand pull switch construction in assembled relation, it will be seen that provision is made 'for operating a lamp for both the socket and from a remote switch such as a wall switch which may be of any suitable character in order to provide convenient controls for the lamp in the socket.

Having thus described my invention, what I claim as new is A circuit controlling and operating mechanism for three Way lamp sockets, comprising a pair of insulating plates, means mounting'said plates in spaced parallel relation, circularly arranged ratchet teeth formed on one plate, a pair of single contacts arranged on adjacent ratchet teeth, a double contact mounted on a pair of adjacent ratchet teeth in diametrically opposed relation to the first mentioned pair of ratchet teeth, said double contact being formed of a single strip of substantially semi-circular sheet material having the opposite end portions offset in spaced parallel relation to correspond with the offset of said adjacent ratchet teeth, and a manually operable switch having the central portion rotatably mounted between the plates and the ends adapted to engage ,one of the single contacts and one offset portion of said double contact in each position of rotation.

In testimony whereof I affix my signature.

CLARENCE soHULDT. 

